PRP Therapy Explained: What Platelet-Rich Plasma Can and Can't Do

If you've been researching options for a stubborn tendon injury, joint pain, or slow-healing soft tissue problem, you've likely come across the question: what is prp therapy platelet rich plasma? PRP, or platelet-rich plasma, has become one of the most talked-about regenerative treatments in sports medicine and orthopedics — used by professional athletes and everyday patients alike. But between the marketing claims and the genuine science, it can be hard to know what PRP actually is, what it can realistically do, and where its limits are. At The Bridge Health Recovery Center in New Harmony, Utah, we work with guests dealing with chronic pain, fibromyalgia, and complex regional pain syndrome who often ask about regenerative options like PRP as part of a broader recovery plan. This guide breaks down the science in plain English — what PRP is, how it's made, what the research actually supports, and how it compares to other regenerative options like stem cell therapy.

What Is PRP (Platelet-Rich Plasma)?

Platelet-rich plasma is exactly what it sounds like: plasma (the liquid part of your blood) that has been processed to contain a higher-than-normal concentration of platelets. Platelets are best known for their role in blood clotting, but they also store and release dozens of growth factors — proteins that signal your body's cells to migrate, multiply, and repair damaged tissue.

The idea behind PRP therapy is straightforward: take a sample of a patient's own blood, concentrate the platelets several times above their normal level, and inject that concentrate directly into an injured tendon, ligament, muscle, or joint. In theory, this delivers a burst of the body's own healing signals right where they're needed most.

"PRP isn't a foreign substance or a drug — it's a concentrated version of something your body already produces. That's part of why it's generally considered lower-risk than many other injectable treatments." — Dr. Daren Brooks, D.O.

How PRP Is Made: The Actual Process

The process of preparing PRP is fairly consistent across clinics, though the specifics (and quality) can vary:

1. Blood draw: A provider draws a small amount of your blood, similar to a routine lab draw (usually 15-60mL).
2. Centrifugation: The blood is spun in a centrifuge at a specific speed and duration, separating it into layers — red blood cells, platelet-poor plasma, and the platelet-rich layer (the 'buffy coat').
3. Concentration: The platelet-rich layer is drawn off, typically concentrating platelets to 3-8 times their normal blood level, depending on the system used.
4. Injection: The concentrated PRP is injected into the target area, often using ultrasound guidance for precision, especially for joints and deep tendons.

How PRP Is Thought to Work

The proposed mechanism behind PRP centers on the growth factors platelets release when they're activated, including platelet-derived growth factor (PDGF), transforming growth factor-beta (TGF-β), and vascular endothelial growth factor (VEGF). These signaling proteins are thought to:

• Recruit repair cells to the site of injury
• Stimulate collagen production in tendons and ligaments
• Promote new blood vessel formation to improve local blood supply
• Modulate local inflammation

It's important to be clear-eyed here: this is the proposed biological mechanism, and while there's solid basic-science support for how growth factors behave in a lab setting, translating that into consistent, measurable clinical improvement in real patients is where the evidence gets more complicated — which we'll cover in detail below.

What Conditions Is PRP Used For?

PRP is used, with varying levels of supporting evidence, for a range of musculoskeletal conditions, including:

• Tendon injuries: tennis elbow (lateral epicondylitis), golfer's elbow, Achilles tendinopathy, patellar tendinopathy (jumper's knee)
• Osteoarthritis: particularly knee OA, and to a lesser extent hip and shoulder OA
• Ligament injuries: partial ligament tears, including some early-stage ACL and MCL injuries
• Muscle strains: hamstring and other soft tissue muscle injuries, especially in athletes
• Post-surgical healing support: sometimes used alongside rotator cuff repair or other orthopedic procedures
• Related conditions we discuss in our joint pain program and our overview of realistic expectations for knee pain treatment

PRP is not considered an appropriate treatment for acute fractures, severe structural tears requiring surgical repair, active infections, or as a substitute for necessary surgery — a physician evaluation should always come first.

What Does the Evidence Actually Show?

This is the section where marketing claims and real evidence often diverge, so let's look at it honestly.

Where evidence is more supportive: Multiple randomized controlled trials and meta-analyses have found PRP may offer meaningful pain reduction and functional improvement for chronic lateral epicondylitis (tennis elbow) compared to corticosteroid injections or placebo, particularly at longer-term follow-up (6-12 months).

Where evidence is mixed: For knee osteoarthritis, results across studies are inconsistent — some trials show modest pain and function improvements over hyaluronic acid or saline injections, while others show no significant difference. Study quality, PRP preparation method, and injection protocol all affect these results significantly.

Where evidence is limited: For many other uses — including some ligament and muscle applications — research is still preliminary, with smaller studies and less long-term follow-up data.

Major medical bodies, including guidance referenced by the National Institutes of Health, generally describe PRP as a promising but still-maturing therapy that may help select patients, rather than a proven, universally effective treatment.

PRP vs. Stem Cells vs. Cortisone

Patients researching regenerative options often want to know how PRP stacks up against other choices:

• PRP vs. cortisone (steroid) injections: Cortisone often provides faster short-term pain relief but can weaken tendon tissue with repeated use over time. PRP tends to work more slowly (weeks, not days) but doesn't carry the same tissue-weakening risk.
• PRP vs. stem cell therapy: Stem cell therapy uses cells intended to help regenerate tissue, typically harvested from bone marrow or adipose (fat) tissue, and is generally more invasive, more expensive, and even less standardized in the evidence than PRP. We go in-depth on this comparison in how PRP compares to stem cells and cortisone.
• PRP vs. physical therapy/conservative care: For many musculoskeletal conditions, structured physical therapy remains a first-line, well-evidenced approach and is often tried before or alongside PRP rather than instead of it.

For a broader look at where the regenerative medicine field stands overall, see our guide on how stem cell therapy works and our honest breakdown of what's actually FDA-approved in regenerative medicine.

What to Expect: Procedure, Recovery, Cost

If you and your physician decide PRP is worth trying, here's what the process typically looks like:

• Consultation and evaluation: A physician reviews imaging, prior treatments, and overall health to determine if PRP is an appropriate option and to rule out conditions PRP won't help.
• The procedure: Blood draw, centrifugation (usually 10-15 minutes), and injection, often done in a single office visit lasting under an hour.
• Recovery: Mild soreness or swelling for a few days is common. Most providers recommend avoiding NSAIDs (like ibuprofen) around the time of injection, since they can blunt the inflammatory response PRP relies on.
• Follow-up: Many protocols involve a series of 1-3 injections spaced weeks apart, with reassessment at 6-12 weeks to gauge response.
• Cost: Typically several hundred to over a thousand dollars per injection, usually not covered by insurance since it's considered elective/off-label.

How to Choose a Reputable Provider

Because PRP and other regenerative treatments sit in a less tightly regulated space than FDA-approved drugs, it's worth being selective about where you get treated. Warning signs of a less reputable clinic include:

• Marketing language that promises a "cure," guarantees results, or claims PRP is "FDA-approved" for your specific condition
• Providers who won't clearly explain how your PRP is prepared or what concentration/protocol they use
• Pressure to pay for a large package of injections upfront before any assessment of your response
• No physician oversight, or a provider without relevant orthopedic, sports medicine, or musculoskeletal training

A trustworthy provider will discuss realistic expectations, explain the evidence honestly (including its limits), and treat PRP as one tool among several — not a miracle fix. This same due diligence applies to any regenerative treatment, including stem cell options, which we cover in our guide to what the evidence shows for joint regeneration.

This article is educational and does not constitute medical advice. PRP and other regenerative treatments should only be pursued after a thorough evaluation by a qualified physician, who can assess whether it's appropriate for your specific condition and medical history.

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